Both the E75 and the E55 were announced together at the Mobile World Congress this year. Software wise they hardly differ from each other but the E75 has already been released in many countries. Meanwhile there is still no word on the release of the E55.
There is a possibility that the E55 has been delayed since we are already in the last weeks of Q2 which is actually the official time frame of when the E55 should arrive at the shops. The reason why the E75 was released so much earlier and the supposed delay of the E55 could be because the E75 is partly based on the older hardware platform. It still uses the old CPU clocked at 369MHz while the E55 is based on the newer CPU with 600MHz like the most recently announced Nokia cell phones i.e. Nokia 5630 XM, Nokia 6720 classic/navigator etc.. But since the 5630 XM was also released a while ago the hardware optimization doesn’t have to be a reason for the supposed delay.
More appropriate reasons could be that Nokia wants to release both the E52 and E55 at the same moment or that Nokia is too busy with the N97. After all they announced a simultaneous June release of their flagship smart phone in more than 75 countries which even for a company like Nokia is a big feet. Besides that Nokia’s long awaited 8MP camera phone the N86 is also supposed to be launched this month. All in all Nokia should have many things on their hands in the upcoming weeks. Therefore the launch of the E55 and E55 in this month is questionable.
You can discuss the release date of the E55 in our forum.